AIAZHFree Developer Tools Online - JSON Formatter, Regex Tester
20 free developer tools that run entirely in your browser - no upload, no servers, complete privacy.
JSON Formatter & Validator
Format, validate, and minify JSON data instantly in your browser.
HTML / Markdown Preview
Write HTML or Markdown and see a live preview as you type.
Case Converter
Convert text between camelCase, snake_case, kebab-case, and more.
Password Generator
Generate strong random passwords with crypto-grade randomness.
UUID Generator
Generate UUID v4 identifiers for databases and APIs.
Base64 Encode / Decode
Encode text or files to Base64 and decode back - no server.
URL Encode / Decode
Encode or decode URL-encoded strings instantly in your browser.
Text Diff Checker
Compare two texts and highlight differences line by line.
Lorem Ipsum Generator
Generate placeholder text in paragraphs, sentences, or words.
Regex Tester
Test regular expressions against input text with match highlighting.
Unit Converter
Convert length, weight, temperature, area, and volume units.
Color Converter
Convert between HEX, RGB, HSL, and HSV color formats locally.
Timestamp Converter
Convert Unix timestamps to human-readable dates and back.
Hash Generator
Generate SHA-256, SHA-384, and SHA-512 hashes - no server.
QR Code Generator
Create QR codes with custom colors and error correction levels.
QR Code Scanner
Scan QR codes from image upload or camera - runs locally.
Word Counter
Count words, characters, and reading time in your browser.
Code Screenshot Generator
Turn code into beautiful screenshots with themes and syntax highlighting.
CSS Gradient Generator
Design CSS gradients with a visual editor — linear, radial, and conic.
Animated Background Generator
Animated Background Generator
Free Developer Tools Online - JSON Formatter, Regex Tester in Your Browser
Every developer tool runs directly in your browser using JavaScript and Web APIs. When you format JSON, test regex, or generate a password, your data never leaves your device - no upload, no server, no waiting. This means your API keys, tokens, and config files stay private. Open any tool and get results in seconds.
How to format JSON online in your browser?
Open the JSON Formatter, paste your messy or minified JSON into the input area, and click Format. Get a beautifully indented, readable version instantly - no upload required.
How to test regex patterns online for free?
Open the Regex Tester, enter your regular expression and test string. See live match highlighting, capture groups, and group details - all processed in your browser.
How to generate secure passwords in your browser?
Open the Password Generator, choose your length and character sets, and generate cryptographically secure passwords using the Web Crypto API - no server involved.
Are these developer tools safe for sensitive data?
Yes. Every tool runs entirely in your browser - your API keys, tokens, and config files never leave your device. No uploads to servers, no logging, no tracking.
Is there a file size limit for developer tools?
No. Because your data stays on your own computer, there are no artificial limits. You can process JSON, text, and files of any size, limited only by your browser memory.